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a process for the preparation of 3,4,5-trifluoronitrobenzene
procede de preparation de 3,4,5-trifluoronitrobenzene
Ultimo aggiornamento 2014-11-25
Frequenza di utilizzo: 4
Qualità:
the process as claimed in one or more of claims 2 to 6, wherein 2,3,4-trifluoronitrobenzene is used as the solvent.
procédé selon l'une ou plusieurs des revendications 2 à 6, caractérisé en ce que l'on utilise le 2,3,4-trifluoronitrobenzène comme solvant.
Ultimo aggiornamento 2014-12-04
Frequenza di utilizzo: 2
Qualità:
the present invention relates to a process for the preparation of 3,4,5-trifluoronitrobenzene of the formula (1).
l'invention concerne un procédé de préparation de trifluoronitrobenzène de formule (1).
Ultimo aggiornamento 2014-12-03
Frequenza di utilizzo: 1
Qualità:
after filtering and drying under vacuum in the presence of p.sub.2 o.sub.5, it was recrystallized from 96 analysis of the product obtained yielded the following results: ______________________________________analysis calculated for c.sub.10 h.sub.15 n.sub.3 o.sub.4 found______________________________________c % 49.78 49.73h % 6.27 6.28n % 17.42 17.38o % 26.53 26.64______________________________________ preparation example 4 preparation of 3-[(3-methylamino-5-methylamino-4-nitro) phenoxy]-propane 1,2-diol ##str8## stage 1 preparation of 2-methylamino-6-methylamino-4-fluoronitro benzene 11 ml of 2,4,6-trifluoronitrobenzene was added dropwise to 65 ml of a solution of 25% methylamine in absolute ethanol, maintaining the temperature between -10 addition was complete, the reaction medium was left for 1 hour at room temperature.
après essorage puis séchage sous vide en présence de p₂o₅, il est recristallisé de l'éthanol à 96°. il fond à 142°c. l'analyse du produit obtenu donne les résultats suivants : exemple de préparation 4 préparation du 3-[(3-méthylamino-5-méthylamino-4-nitro) phénoxy] propane 1,2-diol 1ère étape : préparation du 2-méthylamino-6-méthylamino 4-fluoronitrobenzène on introduit, goutte à goutte, 11 ml de 2,4,6-trifluoronitro benzène à 65 ml d'une solution de méthylamine à 25% dans l'éthanol absolu, la température est maintenue entre -10°c et 0°c par refroi dissement.
Ultimo aggiornamento 2014-12-03
Frequenza di utilizzo: 1
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